Mazda 3 - EGR Valve

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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4
INSPECT POWER CIRCUIT FOR OPEN
CIRCUIT
• Turn the ignition switch to the ON
position (Engine off).
• Measure the voltage following terminal
and body ground.
- EGR valve terminal C
- EGR valve terminal D
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace harness for open circuit then
go to Step 10.
5
INSPECT EGR VALVE
• Perform EGR valve inspection.
(See EGR VALVE INSPECTION.)
• Is EGR valve normal?
Yes
Go to the next step.
No
Replace the EGR valve, then go to Step 10.
6
INSPECT FOR CONTROL CIRCUIT FOR
SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity following terminal
and body ground:
- EGR valve terminal E
- EGR valve terminal A
- EGR valve terminal B
- EGR valve terminal F
• is there continuity?
Yes
Repair or replace wiring harness for short to
ground, then go to Step 10.
No
Go to the next step.
7
INSPECT FOR CONTROL CIRCUIT FOR
SHORT TO POWER
• Turn the ignition switch to the ON
position (Engine off).
• Measure the voltage following terminal
and body ground:
- EGR valve terminal E
- EGR valve terminal A
- EGR valve terminal B
- EGR valve terminal F
• Is the voltage B+?
Yes
Repair or replace wiring harness for short to
power supply, then go to Step 10.
No
Go to the next step.
8
INSPECT POOR CONNECTION OF PCM
• Turn the ignition switch off.
• Disconnect the PCM connector.
Yes
Repair or replace the terminals and/or
connector, then go to Step 10.
No
Go to the next step.